Antigovernment protester Mohammed Ali, his face painted with the colors of his national flag, is seen during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen. Muhammed Muheisen/AP

A Palestinian man performs a somersault as others watch on the beach of Gaza City. Bernat Armangue/AP

Daniel Sneed, a seasonal hatchery employee of the Connecticut Department of Environmental Protection, launches a net full of trout into the Natchaug River in Chaplin, Conn. in preparation for Saturday's first day of the fishing season. Sean D. Elliot/AP

A cow enjoys the cleaning brush at a stable in Kerken, Germany. The washer can be self-started by the cows to clean and massage the fur. The cows often queue to use the brushes. They make them feel comfortable and produce more and better milk, farmer Andreas Straetmans said. Frank Augstein/AP

Anna Hsu mimics teacher Kennis Wong as children sing a Chinese song at Broadway Elementary School in Venice, Los Angeles, California. The school launched one of only two English-Mandarin Chinese dual-language immersion programs in the Los Angeles Unified School District in September 2010. Lucy Nicholson/Reuters

Tourists participate in a water fight with Thais during the Songkran Festival celebration at Khaosan Road in Bangkok. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck. Chaiwat Subprasom/Reuters

Members of the Fanfare Team of the Central Band of Britain 's Royal Air Force, pose in front of a replica of a World War II-era Hawker Hurricane fighter, at a media event at RAF Northolt, London. The fanfare team will play a specially composed piece at the wedding of Britain's Prince William and Kate Middleton inside London's Westminster Abbey during the service on April 29. Alastair Grant/AP

Queen Beatrix of the Netherlands holds her hat as she arrives on a stormy and rainy day at Bellevue Palace in Berlin. Queen Beatrix arrived for a four-day official visit in Germany. Markus Schreiber/AP

Two girls pose on a chair during the International Furniture Fair in Milan, Italy. Alessandro Garofalo/Reuters

People wait in lines at a checkpoint outside Abidjan, Ivory Coast, to have their bags searched and ID documents checked by republican forces, as they take public transport for the country's interior one day after soldiers allied with Alassane Ouattara captured strongman Laurent Gbagbo. Rebecca Blackwell/AP

People stand next to flowers and candles laid near the entrance to the Oktyabrskaya metro station in Minsk. Police in Belarus carried out spot checks on roads and at stations and airports on Tuesday after a bomb blast tore through a crowded metro station in the capital Minsk on Monday evening, killing at least 12 people. Vladimir Nikolsky/Reuters

Civil War reenactors prepare to fire a cannon at Fort Johnson, near Fort Sumter, to commemorate the moment the first shots of the Civil War were fired 150 years ago, at Charleston Harbor in Charleston, S.C. Alice Keeney/AP

Assailed first by a debt crisis, then acting as a front line in Europe’s migrant crisis, Greece has had an extremely difficult few years. Yet it has avoided civil conflict and has remained in the eurozone, contrary to many expectations.